INTRODUCTION - Chapter 6 - Life Processes - Ncert Solutions class 10 - Science

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Question 1:

Why is diffusion insufficient to meet the oxygen requirementsof multi-cellular organisms like humans?

Answer:

Multicellular organisms such as humans possess complex body designs. They have specialised cells and tissues for performing various necessary functions of the body such as intake of food and oxygen. Unlike unicellular organisms, multicellular cells are not in direct contact with the outside environment. Therefore, diffusion cannot meet their oxygen requirements.

Question 2:

What criteria do we use to decide whether something is alive?

Answer:

Any visible movement such as walking, breathing, or growing is generally used to decide whether something is alive or not. However, a living organism can also have movements, which are not visible to the naked eye. Therefore, the presence of life processes is a fundamental criterion that can be used to decide whether something is alive or not.

Question 3:

What are outside raw materials used for by an organism?

Answer:

An organism uses outside raw materials mostly in the form of food and oxygen. The raw materials required by an organism can be quite varied depending on the complexity of the organism and its environment.

Question 4:

What processes would you consider essential for maintaining life?

Answer:

Life processes such as nutrition, respiration, transportation, excretion, etc. are essential for maintaining life.